Pileus Git - grits/blob - src/plugin-ridge.c

   1 #include <config.h>
   2 #include <gtk/gtk.h>
   3 #include <curl/curl.h>
   4 #include <GL/gl.h>
   5
   6 #include <stdio.h>
   7
   8 #include "aweather-gui.h"
   9 #include "data.h"
  10
  11 enum {
  12         LAYER_TOPO,
  13         LAYER_COUNTY,
  14         LAYER_RIVERS,
  15         LAYER_HIGHWAYS,
  16         LAYER_CITY,
  17         LAYER_COUNT
  18 };
  19
  20 typedef struct {
  21         gchar *fmt;
  22         float z;
  23         guint tex;
  24 } layer_t;
  25
  26 static layer_t layers[] = {
  27         [LAYER_TOPO]     = { "Overlays/" "Topo/"     "Short/" "%s_Topo_Short.jpg",     1, 0 },
  28         [LAYER_COUNTY]   = { "Overlays/" "County/"   "Short/" "%s_County_Short.gif",   3, 0 },
  29         [LAYER_RIVERS]   = { "Overlays/" "Rivers/"   "Short/" "%s_Rivers_Short.gif",   4, 0 },
  30         [LAYER_HIGHWAYS] = { "Overlays/" "Highways/" "Short/" "%s_Highways_Short.gif", 5, 0 },
  31         [LAYER_CITY]     = { "Overlays/" "Cities/"   "Short/" "%s_City_Short.gif",     6, 0 },
  32 };
  33
  34 static AWeatherGui *gui = NULL;
  35
  36 /**
  37  * Load an image into an OpenGL texture
  38  * \param  filename  Path to the image file
  39  * \return The OpenGL identifier for the texture
  40  */
  41 void load_texture(gchar *filename, gpointer _layer)
  42 {
  43         layer_t *layer = _layer;
  44         aweather_gui_gl_begin(gui);
  45
  46         /* Load image */
  47         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
  48         if (!pixbuf)
  49                 g_warning("Failed to load texture: %s", filename);
  50         guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
  51         int        width  = gdk_pixbuf_get_width(pixbuf);
  52         int        height = gdk_pixbuf_get_height(pixbuf);
  53         int        format = gdk_pixbuf_get_has_alpha(pixbuf) ? GL_RGBA : GL_RGB;
  54
  55         /* Create Texture */
  56         glGenTextures(1, &layer->tex);
  57         glBindTexture(GL_TEXTURE_2D, layer->tex); // 2d texture (x and y size)
  58
  59         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  60         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
  61                         format, GL_UNSIGNED_BYTE, pixels);
  62         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  63         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  64
  65         g_message("loaded image:  w=%-3d  h=%-3d  fmt=%x  px=(%02x,%02x,%02x,%02x)  img=%s",
  66                 width, height, format, pixels[0], pixels[1], pixels[2], pixels[3],
  67                 g_path_get_basename(filename));
  68
  69         aweather_gui_gl_end(gui);
  70
  71         /* Redraw */
  72         gtk_widget_queue_draw(aweather_gui_get_widget(gui, "drawing"));
  73 }
  74
  75 static void set_site(AWeatherView *view, gchar *site, gpointer user_data)
  76 {
  77         g_message("location changed to %s", site);
  78         for (int i = 0; i < LAYER_COUNT; i++) {
  79                 gchar *base = "http://radar.weather.gov/ridge/";
  80                 gchar *path  = g_strdup_printf(layers[i].fmt, site);
  81                 cache_file(base, path, load_texture, &layers[i]);
  82                 g_free(path);
  83         }
  84 }
  85
  86 static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
  87 {
  88         g_message("ridge:expose");
  89         glPushMatrix();
  90         glEnable(GL_TEXTURE_2D);
  91         glColor4f(1,1,1,1);
  92
  93         for (int i = 0; i < LAYER_COUNT; i++) {
  94                 glBindTexture(GL_TEXTURE_2D, layers[i].tex);
  95
  96                 glBegin(GL_POLYGON);
  97                 glTexCoord2f(0.0, 0.0); glVertex3f(250*1000*-1.0, 250*1000* 1.0, layers[i].z);
  98                 glTexCoord2f(0.0, 1.0); glVertex3f(250*1000*-1.0, 250*1000*-1.0, layers[i].z);
  99                 glTexCoord2f(1.0, 1.0); glVertex3f(250*1000* 1.0, 250*1000*-1.0, layers[i].z);
 100                 glTexCoord2f(1.0, 0.0); glVertex3f(250*1000* 1.0, 250*1000* 1.0, layers[i].z);
 101                 glEnd();
 102         }
 103
 104         glPopMatrix();
 105         return FALSE;
 106 }
 107
 108 gboolean ridge_init(AWeatherGui *_gui)
 109 {
 110         gui = _gui;
 111         GtkDrawingArea *drawing = GTK_DRAWING_AREA(aweather_gui_get_widget(gui, "drawing"));
 112         AWeatherView   *view    = aweather_gui_get_view(gui);
 113
 114         /* Set up OpenGL Stuff */
 115         g_signal_connect(drawing, "expose-event",     G_CALLBACK(expose),    NULL);
 116         g_signal_connect(view,    "location-changed", G_CALLBACK(set_site),  NULL);
 117
 118         return TRUE;
 119 }